Steam-boiler.



T. F. DOWNEY.

STEAM BOILER.

APPLICATION FILED MAY 1, 1909.

1,097,402. Patented May 19, 1914.

COLUMBIA PLANOGRAPH $0., WASHINGTON, n. c.

THOMAS F. DOVVNEY. OLE GI-IICAGO, ILLINOIS.

STEAM-BOILER.

memos.

Specification of Letters Patent.

Application filed May 1, 1909.

Patented Ma y 19, 1914. Serial No. 493,251.

1/ b all wit/HM it may concern.

Be it known that I, THOMAS F. Downer, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in SlJGtIlIl-BOllGIS, of which the following is a specification.

()ne of the objects of this invention is to produce an internallyiired fire-box boiler.

Another object of the invention is to produce an improved heater especially adapted for \i'arming buildings and comprising, in a unitary structure, a boiler, a furnace and an ash receptacle.

Another object is to provide a flue for boilers ot the Scotch type, in which the pressure upon the flue is borne by the ten sile strength of the flue plates.

Another object is to provide such a construction of retlu'u-tubular boilers that there shall be ample lire-box space and so that soot and dust carried by the gases may have an opportunity to settle before the gases enter the return fines.

A further object is to provide improved means for bracing fire box boilers,

A further object is to provide a special garbage-burning grate in a steam-generating unit,

A, Further object is to construct a boiler in such a way that the crown sheet shall be covered with water even though the general water level has been reduced below the top of the tire-box, thereby avoiding overheating the crown sheet.

A. further objectis to avoid the formation of scams or rivet heads within the the box.

A further object is to obviate the neces sity for using stay bolts in fire-boa boilers.

The invention also relates to the other improvements in boilers and furnaces hereinafter set forth.

In the accompanying drawings, Figure 1 is a longitudinal vertical central section througl'i a steam-generating unit embodying the features of my invention. F 2 is a transverse section on line 2 2 of Fig. 1. Fig. 3 is a diagrannnatic cross-section of a Scotch or marine boiler embodying my invention.

The embodiment shown in Figs. 1 and 9 is especially adapted for steam-heating purposes. It comprises a shell 1 of generally circular form in crosssection, the lower por tion of said shell having an opening there- 'plates 6, 7 and 9.

in extending from one end of the boiler to the other. This opening, in the present instance, is of sutlicicnt width to accommodate the grate. At opposite sides of the opening the shell 1 is continued in the two vertical portions 2 which constitute sup ports for the boiler and side walls for the ash-pit. Bars 2 of channel or other suitable cross sectional form may be secured to the lower edges of the portions 2. The front tube sheet and the rear tube sheet 1 are ot substantially similar outline and have outturncd flanges 5 by means of which they are secured to the shell 1. The combustion chamber extends longitudinally of the shell. 1 from one end thereof to the other. Itis formed by a crown sheet 6, and two side plates 7, said plates being curved on the arcs of circles of the same radius as is the shell 1. The lower edges of the side plates 7 are riveted or otherwise secured to the shell 1 and preferably to the vertical portions 2 below the grates, as at 8. The upper edges of the side plates 7 and the side edges of the crown sheet 6 are secured together and stayed by two plates 9, the edges of plates 6 and 7 lying at opposite sides of the plates 2) and being connected thereto, as by rivets 10. Rivets l1 connect the upper edge portions of the stay plates 9 with the shell 1. The ends of the plates 6 and 7 are secured to the front and rear tube sheets by means of flanges 12 formed on said plates. As

shown in Fig. 2, the plates 6 and 7 are ar-v ranged with their concave sides disposed toward the space within which pressure exists in use, and consequently the steam pressure is resisted by the tensile strength of the The plates 9 serve as calking strips between the edge portions of the plates 6 and 7. In the plates 9 are openings 13 to permit of a circulation of the water. The spaces between the shell 1 and the plates 6 and 7 contain a suitable number of return flues 14.

The grate 15 may be of any suitable form.

16 represents a bridge wall which may be of any common or preferred form.

The combustion chamber 17 has a fire door 18. A smoke box or breeching 19 is formed by an extension of the shell 1 beyond the front tube sheet, and the lower wall 20. Said smoke box is provided with a door 21.

22 is the smoke fine.

At the rear end of the boiler a chamber 23 is "formed by an extension of the shell 1 and by a rear vertical wall 2 L. Said wall may have a lining of brick or tile.

If desired, a grate may be provided in the rear portion of the flue formed by the plates 6 and 7, for the destruction of garbage. As herein shown, an up 'ardly and rearwardly inclined grate 26 extends from a low wall 27 to the wall 2%, garbage being introduced through an opening 28 which is normally closed by a door 29. Preferably an opening 30 is provided in the lower portion of the grate 26 through which the ashes may pass into the ash pit 31. Said opening is normally closed by aslide 32 which may be operated by a rod 33. Below the grate is an ash pit 34;. Cleaning openings 35 aiiord access to the ash pits 31 and 34.

The inner ends of the grates 15 and 26 may be supported in any suitable manner other than that herein shown.

In operation, gaseous products of combustion pass from the chamber 17 to the chamber 23 and thence through the flues 14 to the smoke box 19. In traveling from the chamber 17 to the chamber 23, a large portion of the soot and cust carried by the gases settles upon the floor upon which the boiler is set, thereby avoiding the rapid formation of dust deposits in the tlues 14. It will readily be understood that the dust may be removed from the floor much more easily than from the flues.

The plates 9 eiiectively stay the shell 1 and the plates 6 and T.

The flue or fire-box formed by the plates 6 and 7 is very strong and is of ample size to accommodate the grate or grates.

It will be observed that the crown sheet 6 is so shaped that it will remain covered with water as long as possible during a lowering of the water level, thereby greatly lessening the danger of overheating said sheet.

A boiler and furnace constructed as shown in Figs. 1 and 2 is a unitary structure which may be set directly upon a floor and which requires no inclosing or supporting brickwork.

An internal flue may be formed in a boiler of the Scotch or marine type by means of plates 36 37 38 39 as shown in Fig. 3, said plates being curved on the same radius as the shell 1 and being stayed by means of plates 40 t-tl. The latter have openings therein to permit of a circulation of the water. The grate may be supported within the flue in any preferred manner.

I would have it understood that the invention is not limited to the proportions and details herein illustrated and described, for various modifications will occur to persons skilled in the art.

I claim as my invention:

1. In a steam boiler, a generally circular shell having an opening from end to end thereof along its lower side and having parallel vertical supporting portions projecting at each side of the opening; a longitudinally disposed combustion chamber inclosed in the shell and comprising a top wall and two side walls, each of said walls being composed of a single transversely continuous and concavo-convex plate and presenting its convex side to the interior of the combustion chamber, the side plates having their lower edge portions jointed to the shell at opposite sides of the opening, and stay plates jointed to the shell and also to the upper edge portions of the side plates and to the side edge portions of the upper plate, no portion of said combustion chamber projecting above a ho *iZontal plane passing through the axis of said boiler.

2. In a steam boiler, a generally circular shell having a separate longitudinally disposed combustion chamber inclosed therein, the combustion chamber comprising a top wall and two side walls, each of said walls being composed of a single transversely continuous concavo-co-nvex plate, and presenting its convex side to the interior of the combustion chamber, and a pair of stay plates joined to the shell and also to mutually adj acent edge portions of said wall plates.

THOMAS F. DOlVNEY.

\Vitnesses C. PAUL PARKER, GEORGE L. CHINDAHL.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

